Jet-carbureter.



P. DONNDORF.

JET CARBURETBR.

APPLICATION FILED IBB.11,1913.

1,097,401, I Patented May 19, 1914.

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PETER DONNIDORF, OF STUTTGART, GERMANY, ASSIGNOR TO THE FIRM 0F DAIMLER-IVIOTOREN-GESELLSOHAFT, OF UNTERTilRKI-IEIM, GERMANY.

JET-CARBURETER earner.

T all Q/JiLOHZ it may concern p Be it known that I, Pnrnn DONNDORF, asubject of the King of Wurttemberg, residing at liandhausstrasse',Stuttgart,- Germany, have invented an Improved Jet-Carbureter, of whichthe following is a specification.

This invention relates to an improved jet carburetor for internalcombustion engines and relates to that type of carbureter in which, whenthe engine is running idly or at a low speed, the jet. chamber isconnected with the mixing chamber leading to the engine by means of anarrow tube or passage with the object of diminishing the consumption offuel in proportion to the work done. in carbureters of this type,however, on increasing the speed, the fuel overflows from the jet owingto the variation in pressure in the jet chamber.

The object of the present invention is to utilize the fuel overflowingfrom the jet and for this purpose the jet is surrounded by a chamberopen to the jet chamber and adapted to collect the fuel overflowing fromthe jet, the fuel collecting or overflow chamber being connected to themixing chamber by a narrow passage so that when the engine is runningidly, fuel will be drawn from said overflow chamber.

In order that the invention may be more clearly understood, referencemade to the accompanying drawing showing one embodiment of the inventionby way of example.

Figure 1 is a vertical section through the carburetor showing thethrottle valve in open position. Fig. 2 is a horizontal section throughthe throttle valve, and Fig. 3 is a view similar to Fig. 1 showing thethrottle valve in the position it assumes when the engine is runningidly.

a designates the air-supply chamber of the carbureter within which isarranged an open tube or conduit Z) constituting the jet chamber, saidconduit being open at one end to the air-supply chamber a: and at itsother end opening by way of a cylindrical connection 7) into the mixingchamber 0 which is connected to the engine. Fuel is supplied to the jetchamber 7) from a float chamber f through a jet nozzle 1 projecting intothe jet chamber 7) and, surrounded by a chamber 1 which is open to thejet chamber Z; through an annular opening or open Specification ofLetters Patent.

her it and be collected therein.

Patented May l 9, 1914b Application filed February 11, 1913. Serial No.747,773.

ings d in the jet chamber Z), so that any 6X1 cess fuel escaping fromthe jet 9 will fall down through the opening (Z into the cham- The lowerend of the chamber 72. is connected to the to mixing chamber 0 by meansof a narrow tube or passage '5 opening into the cylindrical connectionZ). The communication between the jet chamber Z) and the mixing chamber0 is adapted to be throttled more at or less according to the desiredengine charge and the speed of the engine by means of a preferablycylindrical throttle valve is slidable within a preferably cylindricalcasing a in alinement with the cylindrical conto nection b and having aport a therein adapted to register with a port m in the valve easing 6when the valve 7: is in its fully open position, illustrated in Fig. l,in which case secondary air is supplied to the mixing re chamber 0through the registering ports at and n from the air chamber a.

When the engine is to run idly, the valve In is moved within the valvecasing a so as to cut off direct communication between the so jetchamber 6 and the mixing chamber 0, as illustrated in Fig. 3, a smallquantity of air, however, being capable of passing to the mixing chamber0 from the jet chamber 7) through a small notch, slot or like orifice oin the valve is. This notch or slot 0 isadapted to register with theoutlet orifice of the tube or passage 2' so that, owing to the suc tionof the engine, the fuel collected in the chamber it will be drawnthrough the tube i and simultaneously atomized by the air passingthrough the notch or slot 0 from the jet chamber 6 to the mixing chamber0.

In order to stop the engine, the valve 70 is moved farther toward theleft relatively to to Fig. 3 of the drawings until the notch or slot 0is closed by the cylindrical connection Z).

l claim 1. A jet carburetor for internal combus- 09 tion enginescomprising, in combination, a fuel jet nozzle, an air conduit at rightangles thereto, a mixing chamber at right an gles to and connected tosaid air conduit, an overflow chamber surrounding said nozzle and incommunication with said air conduit, a fuel passage leading from thebottom of said overflow chamber and opening at a point intermediate saidair conduit and mix ing chamber, a valve'casing in alinement withsaidair conduit, a slidable throttle valve therein adapted, when movedtoward said air conduit, to gradually cut-off communication between saidair conduit and mixing chamber, said valve having a notch adapted, whenthe valve is nearly closed, to register with said passage and therebymaintain communication between said air conduit and mixing chamber oversaid passage.

2. A jet carbureter for internal combustion engines, comprising a jetchamber, an air chamber into which said jet chamber opens at one end, amixingchamber, a cylindrical connection between said jet chamber andmixing chamber, a fuel'jet nozzle projecting into saidtjet chamber, afuel overflow chamber surrounding said nozzle and open to said jetchamber, a narrow tube connecting the lower end of said fuel overflowchamber with said cylindrical connection, a cylindrical ported valvecasing in alinement with said cylindrical connection, to which secondaryair is supplied through said port from said air chamber, and acylindrical sliding ported valve in said valve casing adapted tocontrol-the port therein and to throttle the connection between said jetchamber and said mixing chamber and having a notch adapted toregisterwith the outlet end of said tube and to simultaneously establishcommunication over the outlet end of said tube between said jet chamberand mixing chamber.

In testimony whereof I aflix my signature in presence of two witnesses.

. PETER DONNDORF.

Witnesses:

ROBERT UNLAND, ERNEST ENTENMANN.

